Fault Tree Computer-aided Analysis Of The Optimization Algorithm With Application

Fault tree analysis (FTA), an important branch in systems reliability engineering, is a common practical technique used in evaluating reliability and safety for large-complex systems at home and abroad presently. With gradual advancing techniques in computer, FTA is in a state of sound development. It has become a new hot research for reliability analyzer to study rapid and large-scale FTA algorithm and software by using computer. But problems of combinatorial explosion that computational complexity increases with the size of fault tree by exponential growth, visual software developed and application domains widened are awaiting to be further researched. Studies on efficient FTA algorithm play a more important role in widening domains of application of FTA and developing large-scale software for reliability, maintainability and safety. This paper gives an elaborate study on these problems.Computer-aided FTA theory has been expounded in this paper. What's more, the reciprocal transformation rule for main parameters in FTA has been studied. Also, a new method using concepts of intercomparsion between numbers of cut set and path set for fault tree qualitative analysis algorithm and applying the boolean manipulation method and disjoint method for fault tree quantitative analysis is presented here. The proposed method applied properly can be developed to reduce the size of tree and simplify qualitative and quantitative analysis of FTA.By use of C++ language and VC6.0, a program module has been successfully developed for fault tree qualitative and quantitative analysis and also FTA software has been realized based on this module. The software applied the optimized algorithm proposed in this paper with main functions of easily calculating minimal cut sets, minimal path sets, reliability, probability of failure, importance factors and fault diagnosis based on fault tree. The implementation of software has been adopted techniques of high-level arrays reducing dimension and dynamic numerical method with characteristics of quick memory release when some dynamic arrays complete calculations, high computing speed and sound ability to meet the demand of microcomputer for large-scale fault tree analysis.From the comparison of analysizing an illustrative example between FTA software developed in this paper and other reliability software, the optimized algorithm and application software presented here proved scientific and efficient. Else, by further studying on some examples in the domain of safety evaluation and fault diagnosis, Results show it is a practical method for the application to engineering systems.